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Cheap flights from St. Louis to Sofia from $578

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Sofia departing on 6/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from St. Louis to Sofia

Cheap round-trip flights

Enter your travel dates to find the best prices.
Lufthansa Logo
1:27 pm - 1:15 pm
STL
-
SOF
15h 48m
2 stops
Lufthansa Logo
6:25 am - 1:45 pm
SOF
-
STL
15h 20m
1 stop
$763Lufthansa
Tue, Nov 17 - Fri, Dec 4
Lufthansa Logo
1:27 pm - 1:15 pm
STL
-
SOF
15h 48m
2 stops
Lufthansa Logo
6:25 am - 6:09 pm
SOF
-
STL
19h 44m
2 stops
$768Lufthansa
Tue, Nov 17 - Thu, Dec 3
United Airlines Logo
3:15 pm - 6:20 pm
STL
-
SOF
19h 05m
2 stops
United Airlines Logo
6:25 am - 1:45 pm
SOF
-
STL
15h 20m
1 stop
$770United Airlines
Sun, Nov 15 - Fri, Dec 4
United Airlines Logo
3:40 pm - 1:25 pm
STL
-
SOF
13h 45m
1 stop
United Airlines Logo
6:25 am - 1:45 pm
SOF
-
STL
15h 20m
1 stop
$777United Airlines
Sun, Nov 15 - Fri, Dec 4
United Airlines Logo
1:27 pm - 10:45 pm
STL
-
SOF
25h 18m
2 stops
United Airlines Logo
2:05 pm - 3:30 pm
SOF
-
STL
33h 25m
2 stops
$778United Airlines
Sun, Nov 15 - Thu, Dec 3
United Airlines Logo
9:23 am - 6:20 pm
STL
-
SOF
24h 57m
2 stops
United Airlines Logo
6:25 am - 8:37 am
SOF
-
STL
34h 12m
2 stops
$780United Airlines
Sun, Nov 15 - Fri, Dec 4
Lufthansa Logo
3:40 pm - 1:25 pm
STL
-
SOF
13h 45m
1 stop
Lufthansa Logo
6:25 am - 6:09 pm
SOF
-
STL
19h 44m
2 stops
$781Lufthansa
Wed, Nov 18 - Thu, Dec 3
Lufthansa Logo
3:40 pm - 1:25 pm
STL
-
SOF
13h 45m
1 stop
Lufthansa Logo
2:05 pm - 1:45 pm
SOF
-
STL
31h 40m
1 stop
$788Lufthansa
Wed, Nov 18 - Thu, Dec 3
Lufthansa Logo
1:00 pm - 1:15 pm
STL
-
SOF
16h 15m
2 stops
Lufthansa Logo
7:00 pm - 1:45 pm
SOF
-
STL
26h 45m
1 stop
$790Lufthansa
Tue, Nov 17 - Thu, Dec 3
United Airlines Logo
5:18 pm - 6:20 pm
STL
-
SOF
17h 02m
2 stops
United Airlines Logo
2:00 pm - 4:40 pm
SOF
-
STL
34h 40m
2 stops
$792United Airlines
Sun, Nov 15 - Wed, Dec 2

Lufthansa flights from St. Louis to Sofia

Our best Lufthansa deals on St. Louis to Sofia flight tickets
Lufthansa
Nov 17
STL1:27 pmLambert-St Louis
15h 48m
2 stops
SOF1:15 pmSofia
Dec 4
SOF6:25 amSofia
15h 20m
1 stop
STL1:45 pmLambert-St Louis
$763
Lufthansa
Nov 17
STL1:27 pmLambert-St Louis
15h 48m
2 stops
SOF1:15 pmSofia
Dec 3
SOF6:25 amSofia
19h 44m
2 stops
STL6:09 pmLambert-St Louis
$768
Lufthansa
Nov 18
STL3:40 pmLambert-St Louis
13h 45m
1 stop
SOF1:25 pmSofia
Dec 3
SOF6:25 amSofia
19h 44m
2 stops
STL6:09 pmLambert-St Louis
$781

United Airlines flights from St. Louis to Sofia

Our best United Airlines deals on St. Louis to Sofia flight tickets
United Airlines
Nov 15
STL3:15 pmLambert-St Louis
19h 05m
2 stops
SOF6:20 pmSofia
Dec 4
SOF6:25 amSofia
15h 20m
1 stop
STL1:45 pmLambert-St Louis
$770
United Airlines
Nov 15
STL3:40 pmLambert-St Louis
13h 45m
1 stop
SOF1:25 pmSofia
Dec 4
SOF6:25 amSofia
15h 20m
1 stop
STL1:45 pmLambert-St Louis
$777
United Airlines
Nov 15
STL1:27 pmLambert-St Louis
25h 18m
2 stops
SOF10:45 pmSofia
Dec 3
SOF2:05 pmSofia
33h 25m
2 stops
STL3:30 pmLambert-St Louis
$778

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Sofia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated May 28, 2026.
Use the filters below to find and compare flights from St. Louis to Sofia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 11/17

1:27 pm-1:15 pm

2 stops15h 48m

Sofia

Fri 12/4

6:25 am-1:45 pm

1 stop15h 20m

$763

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 11/17

1:27 pm-1:15 pm

2 stops15h 48m

Sofia

Thu 12/3

6:25 am-6:09 pm

2 stops19h 44m

$768

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 11/15

3:15 pm-6:20 pm

2 stops19h 05m

Sofia

Fri 12/4

6:25 am-1:45 pm

1 stop15h 20m

$770
Quickest round-trip

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 11/15

3:40 pm-1:25 pm

1 stop13h 45m

Sofia

Fri 12/4

6:25 am-1:45 pm

1 stop15h 20m

$777

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 11/15

1:27 pm-10:45 pm

2 stops25h 18m

Sofia

Thu 12/3

2:05 pm-3:30 pm

2 stops33h 25m

$778

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 11/15

9:23 am-6:20 pm

2 stops24h 57m

Sofia

Fri 12/4

6:25 am-8:37 am

2 stops34h 12m

$780

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 11/18

3:40 pm-1:25 pm

1 stop13h 45m

Sofia

Thu 12/3

6:25 am-6:09 pm

2 stops19h 44m

$781

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 11/18

3:40 pm-1:25 pm

1 stop13h 45m

Sofia

Thu 12/3

2:05 pm-1:45 pm

1 stop31h 40m

$788

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Tue 11/17

1:00 pm-1:15 pm

2 stops16h 15m

Sofia

Thu 12/3

7:00 pm-1:45 pm

1 stop26h 45m

$790

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Sun 11/15

5:18 pm-6:20 pm

2 stops17h 02m

Sofia

Wed 12/2

2:00 pm-4:40 pm

2 stops34h 40m

$792

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 12 resultsSorted by cheapest first
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See travel insights to Sofia from

How to get the cheapest flight ticket from St. Louis to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between St. Louis and Sofia?

What is the cheapest month to fly to Sofia?

The cheapest month to fly to Sofia from St. Louis is in October. Flight prices, which tend to average around $0, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of October, then book flights to Sofia from St. Louis during January instead. Flights to Sofia in January, while not as cheap as those in October, still average around $528.

Can stopping save me money on St. Louis to Sofia flights?

You could potentially save up to 19% on your flight if you consider stops on a St. Louis to Sofia flight.

When to book flights from St. Louis to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Sofia according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Sofia (STL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Sofia

Fastest flight time

19h 30m

Direct flights

None
The fastest flight from St. Louis to Sofia takes 19h 30m
There are no direct flights from St. Louis to Sofia. There are no popular flight routes from St. Louis to Sofia.
Search flight deals

Frequently asked questions about flying from St. Louis to Sofia

  • How far is Lambert-St Louis to Sofia by plane?

    A flight from Lambert-St Louis to Sofia will travel around 5441.0 mi. 19h 30m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?

    Prices for flights from Lambert-St Louis Airport to Sofia Airport are updated daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Sofia Airport.

  • What documentation or ID do you need to fly to Sofia Airport?

    The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Sofia?

Best airlines flying from St. Louis to Sofia

Compare and see reviews for airlines that fly from St. Louis to Sofia with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $559Free CancellationRating
7.4
9,760 reviews
Search United Airlines flights
LufthansaPriceFrom $567Free CancellationRating
6.8
8,032 reviews
Search Lufthansa flights
Air CanadaPriceFrom $1,108Free CancellationRating
7.1
11,096 reviews
Search Air Canada flights

Traveling to a place near Sofia?

Book flights to Sofia if you plan to visit one of these locations
Bansko
Borovets
Velingrad
Sandanski

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Sofia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Sofia. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Sofia with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Sofia from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Sofia?

Once all potential St. Louis to Sofia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Sofia right now. Can momondo alert me if prices change?

Price alerts on flights to Sofia from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Fly your favorite airline to Sofia

Airlines are sorted and displayed according to clicks in the past 7 days on momondo
Lufthansa
United Airlines
Air Canada